Anisus
Shells of Anisus vorticulus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Superorder:	Hygrophila
Family:	Planorbidae
Subfamily:	Planorbinae
Tribe:	Planorbini
Genus:	Anisus H. Studer, 1820[1]
Synonyms[2]
Anisus (Anisus) S. Studer, 1820· accepted, alternate representation Anisus (Costorbis) Lindholm, 1926· accepted, alternate representation Anisus (Disculifer) C. R. Boettger, 1944· accepted, alternate representation † Anisus (Odontogyrorbis) Lörenthey, 1906 (junior synonym) † Anisus (Pseudocarinogyraulus) Popova & Starobogatov, 1970· accepted, alternate representation Anisus (Spiralina) Martens, 1899 (junior homonym of Spiralina Chaster, 1898; junior synonym) Diplodiscus Westerlund, 1897 (junior subjective synonym; also a junior homonym of Diplodiscus Diesing, 1835) † Odontogyrorbis Lörenthey, 1906 Paraspira Dall, 1905 † Paraspira (Odontogyrorbis) Lörenthey, 1906 (junior synonym) Paraspira (Paraspira) Dall, 1905 Planorbis (Anisus) Studer, 1820 (combination not accepted) Planorbis (Costorbis) Lindholm, 1926 (original rank) † Planorbis (Odontogyrorbis) Lörenthey, 1906 (junior synonym) Planorbis (Spiralina) von Martens, 1899 (Invalid: junior homonym of Spiralina Chaster, 1898) Planorbis (Spirorbis) Swainson, 1840 (Invalid: junior homonym of Spirorbis Daudin, 1800 [Polychaeta]; junior synonym) Spiralina Martens, 1899 (junior homonym of Spiralina Chaster, 1898; junior synonym)

Anisus is a genus of small air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the subfamily Planorbinae of the family Planorbidae, the ramshorn snails and their allies.^[2]

Species

The genus contains the following species:

Subgenus Anisus

• Anisus calculiformis (Sandberger, 1874)
• † Anisus komarovae Prysjazhnjuk, 1974
• † Anisus krambergeri (Halaváts, 1903)
• † Anisus laskarevi Milošević, 1976
• Anisus leucostoma (Millet, 1813)
• † Anisus septemgyratiformis (Gottschick, 1911)
• Anisus septemgyratus (Rossmässler, 1835)
• Anisus spirorbis (Linnaeus, 1758) - the type species of the genus^[3]
• Anisus strauchianus (Clessin, 1884)^[3]

Subgenus Anisus (Costorbis) Lindholm, 1926

• † Anisus densecostatus Schütt, 1994

Subgenus Disculifer C. Boettger 1944

• † Anisus omalus (Bourguignat, 1881)
• Anisus vorticulus^[3]

Subgenus ?

• † Anisus angulatus (Clessin, 1877)
• † Anisus balizacensis (Peyrot, 1932)
• † Anisus brunnensis (Sauerzopf, 1953)
• † Anisus confusus Soós, 1934
• † Anisus depressissimus (Sacco, 1886)
• † Anisus dupuyianus (Noulet, 1854)
• † Anisus falsani (Locard, 1883)
• † Anisus guerichi (Andreae, 1902)
• † Anisus hilgendorfi (Fraas, 1868)
• Anisus issykulensis (Clessin, 1907)
• † Anisus mariae (Michaud, 1862)
• † Anisus matheroni (Fischer & Tournouër, 1873)
• † Anisus metochiensis Milošević, 1976
• Anisus natalensis (Krauss)^[4]
• † Anisus rousianus (Noulet, 1854)
• Anisus vortex (Linnaeus, 1758)^[3]

Subspecies and species brought into synonymy

• Subgenus Anisus (Gyraulus) Agassiz in Charpentier, 1837: synonym of Gyraulus Charpentier, 1837
• Anisus (Gyraulus) terekholicus Prozorova & Starobogato, 1997: synonym of Gyraulus terekholicus (Prozorova & Starobogatov, 1997)
• Subgenus † Anisus (Odontogyrorbis) Lörenthey, 1906: synonym of Anisus (Anisus) Studer, 1820
• Subgenus Anisus (Spiralina) Martens, 1899: synonym of Anisus Studer, 1820
• † Anisus angustigyratus (Sauerzopf, 1953): synonym of † Anisus (Anisus) krambergeri (Halaváts, 1903)
• † Anisus dupuyanus (Noulet, 1854): synonym of † Anisus dupuyianus (Noulet, 1854)
• Anisus septemgyratus auct. (not Rossmässler):^[3] synonym of Anisus calculiformis (Sandberger, 1874)
• Anisus tokyoensis Mori, 1938: synonym of Gyraulus tokyoensis (Mori, 1938)